THE days of travelling outside Blacktown City to get birth and marriage certificates, register a community group, pay fines or seek advice from Fair Trading NSW will soon be over.

The Roads and Maritime Services office in St Martins Crescent will close temporarily on August 30 to make way for a NSW government one-stop-shop service centre.

Blacktown will have the 19th Service NSW centre in NSW when it opens in October.

Services under the one roof will include RMS, Fair Trading, Births, Deaths and Marriages, Housing NSW, and the Offices of State Revenue, Ageing and State Environment and Heritage.

It will have extra counters, and 16 self-service stations with more services to be added over time.

"The Service NSW centre will be one of the largest in NSW, a hub for driver testing in western Sydney, which is why it is remaining at its current registry location," a spokeswoman said.

Around 50,000 registration and licence-renewal notices have been sent customers to redirect them to the website and nearby RMS registries at St Marys, Wetherill Park, Castle Hill and Mount Druitt during the Blacktown refurbishment.

Service NSW officers held a presentation at last week's Blacktown Council policy meeting. Councillors welcomed the new centre but questioned the location, 2.5 kilometres away from Blacktown station.

"It's not easily accessible," Cr Jacqueline Donaldson said.

"But you can do a whole range of things in one trip. We were told waiting times have been halved since these centres were introduced."

Services NSW hopes to have 36 one-stop shops across NSW by June next year and may consider Mount Druitt as a future location.